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Add datatype declarations

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Scott Richmond 2022-08-04 18:43:20 -04:00
parent 5300ca5e3b
commit 9684c2f4c5
1 changed files with 43 additions and 13 deletions
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56
src/ludus/parser.clj
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@ -1041,6 +1041,43 @@
:clauses (get-in clauses [::ast :clauses])}))
(panic parser "Expected { after receive"))))
(defn- parse-data [parser]
(let [dt (advance parser)]
(if (= (token-type dt) ::token/datatype)
(let [dt-ast (parse-datatype dt)
after-dt (token-type dt-ast)]
(case after-dt
::token/newline (assoc dt-ast ::ast {::ast/type ::ast/datatype
:token (current parser)
:constructor-type :nullary})
::token/lparen
(let [pattern (parse-tuple-pattern (advance dt-ast))]
(assoc pattern ::ast {::ast/type ::ast/datatype
:token (current parser)
:constructor-type :tuple
:pattern (::ast pattern)}))
::token/lbrace
(let [pattern (parse-struct-pattern (advance dt-ast))]
(assoc pattern ::ast {::ast/type ::ast/datatype
:token (current parser)
:constructor-type :struct
:pattern (::ast pattern)}))
(panic dt-ast (str "Undexpected " (get-in dt-ast [::token :lexeme]) "after datatype declaration."))))
(panic dt "Expected datatype name after data reserved word."))))
(defn- parse-toplevel [parser]
(case (token-type parser)
::token/ns (parse-ns parser)
::token/import (parse-import parser)
::token/data (parse-data parser)
(parse-expr parser)))
(defn parse-script [origin]
(loop [parser (accept-many #{::token/newline ::token/semicolon} origin)
exprs []
@ -1052,11 +1089,8 @@
(panic parser "Scripts must have at least one expression")
(assoc parser ::ast {::ast/type ::ast/script
:token (current origin) :exprs es})))
::token/ns (parse-ns parser)
::token/import (parse-import parser)
(::token/semicolon ::token/newline)
(::token/semicolon ::token/newline)
(recur
(accept-many #{::token/semicolon ::token/newline} parser)
(add-member exprs current_expr)
@ -1065,7 +1099,7 @@
(let [parsed
(if current_expr
(panic parser "Expected end of expression" #{::token/semicolon ::token/newline})
(parse-expr parser))]
(parse-toplevel parser))]
(recur parsed exprs (::ast parsed))))))
@ -1160,16 +1194,12 @@
(parse-script)))
(do
(def pp pp/pprint)
(def source "Word")
(def source "
data Foo {foo, bar}
(println "")
(println "")
(println "******************************************************")
(println "")
(println "*** *** TEST PARSE *** ***")
")
(pp (::ast (parse (scanner/scan source)))))
(::ast (parse (scanner/scan source))))
(comment "
Further thoughts/still to do: